WO2019057117A1

WO2019057117A1 - Movable hot rolling thermal insulation heat treatment device

Info

Publication number: WO2019057117A1
Application number: PCT/CN2018/106712
Authority: WO
Inventors: 陈勇; 朱蔚林; 王野; 赵春禾; 宋涛
Original assignee: 宝钢湛江钢铁有限公司; 宝山钢铁股份有限公司; 上海贺力液压机电有限公司
Priority date: 2017-09-20
Filing date: 2018-09-20
Publication date: 2019-03-28
Also published as: JP2020534441A; EP3686297A1; KR102397795B1; KR20200063161A; EP3686297A4; EP3686297B1; JP7135091B2

Abstract

A movable hot rolling thermal insulation heat treatment device, comprising: a base plate (1); a steel coil fixing base (2), disposed at the center on the base plate (1); a tray (3), which is of an annular structure and is horizontally fitted at the middle part of the steel coil fixing base (2); a thermal insulation cover (4), having an opening at the lower end and covering the tray (3), the inner cavity volume of the thermal insulation cover (4) being larger than the volume of a steel coil; an electric heating device (5) disposed on the inner side wall of the thermal insulation cover (4); a temperature sensor (6) disposed in the thermal insulation cover (4); and an information acquisition control module (7) electrically connected to the electric heating device (5) and the temperature sensor (6). The device can utilize the heat of a steel coil itself to perform a soaking and slow cooling heat treatment process on the steel coil, thereby achieving the purposes of high efficiency, energy conservation, and improvement of the yield.

Description

Mobile hot coil heat preservation heat treatment device

Technical field

The invention relates to a hot rolling equipment, in particular to a mobile hot coil heat treatment heat treatment device.

Background technique

The production of cold-rolled ultra-high-strength steel mainly has the problem of large fluctuations in the length and width direction of the strip, which leads to the violent fluctuation of the rolling force and the over-tolerance standard of the cold-rolled finished product during cold rolling production, which affects the cold-rolled acid continuous rolling mill. Rolling stability also seriously affects the yield of cold-rolled ultra-high strength steel.

The traditional hot rolling line only completes the steel coil transportation during the coil transportation after the coiling is completed. If the steel coil needs heat treatment, slow cooling, annealing and other treatment processes, special insulation pits, holding furnaces, and cover furnaces are required. , heat treatment and other production lines. It has the characteristics of large investment, high energy consumption, high transportation cost and low finished product rate. Especially for high-strength steel varieties, the above process cannot achieve the desired state due to the aging effect.

At present, mainstream steel mills at home and abroad often use off-line thermal insulation pits, thermal insulation walls or holding furnaces to slow-cool and anneal high-strength steels, further cooling the strips after cooling, and achieving the purpose of improving performance fluctuations and releasing internal stresses. At this stage, some companies have made some stages of development and application of mobile hot-roll annealing control devices, and there are many problems in the use process.

(1) The most prominent problem in the rolling line insulation device is that the interval between the steel strips entering the thermal insulation device is too long, the metallographic transformation of the steel strip has occurred or completed, and the offline slow cooling method improves the performance of the hot coil. The effect cannot meet the quality requirements of high strength steel. It takes 20 to 30 minutes to lift the hot coil into the heat preservation cover. The air cooling time of the steel coil is too long, which affects the heat preservation effect and material performance.

(2) The increase in the cost of setting up special insulation pits, holding furnaces, hood furnaces, heat treatment and other production lines for such insulation devices is generally high and the long construction period affects normal production. And there is a problem that the heat preservation effect (the temperature drop rate is faster) is poor.

(3) This type of thermal insulation cover is basically in offline mode (the thermal insulation device is placed at the reeling platform at rest), and the steel coil transportation lifting and unloading disrupts the normal production rhythm of the production line. Affecting the production capacity of the rolling steel production line, the actual mass production is difficult.

(4) In the current stage, there are only some thermal insulation effects developed by some companies. Because the bottom structure cannot be completely sealed, the steel coil insulation effect is not good.

The Chinese Patent No. CN201210338335 discloses a "roller tray type metal tape roll transport device", which comprises a transport chain tray, and carries on the roll after the coil is taken up. The device is a fixed saddle for transporting only a single coil. On-line insulation of steel coils is not possible during transportation.

The "online thermal insulation slow cooling device" disclosed in the Chinese patent CN201710853613.3 includes: only the heat preservation effect exists, and the steel coil heat preservation effect is not good because the bottom structure cannot be completely sealed.

Japanese Patent No. JP 1985110816 (A) discloses a "single type heat preservation cover", which comprises: a single type of heat preservation cover, a roller conveyor chain structure, which can only achieve the steel coil heat preservation effect.

The "tunnel insulation cover" disclosed in Japanese Patent No. JP2010094710 (A) includes: the increase in the cost of adding a special insulation pit and other production lines is generally high and the long construction period affects normal production.

Summary of the invention

The object of the present invention is to design a mobile hot coil heat treatment heat treatment device, which can utilize the heat of the steel coil itself to perform a soaking and slow cooling heat treatment process on the steel coil, thereby achieving the purpose of high efficiency, energy saving and provision of the finished product rate.

In order to achieve the above object, the technical solution of the present invention is:

The utility model relates to a mobile hot coil heat treatment heat treatment device, which comprises: a bottom plate; a steel coil fixing seat disposed on the center of the bottom plate; a tray and an annular structure horizontally sleeved in a middle portion of the steel coil fixing seat; a heat preservation cover and a lower end opening The cover is disposed on the tray, the inner cavity volume is larger than the steel coil; the electric heating device is disposed on the inner side wall of the heat preservation cover; the temperature sensor is disposed in the heat preservation cover; the information acquisition control module, the electric heating The device and the temperature sensor are electrically connected to the information collection control module.

Preferably, the device further includes a gas protection device and a gas sensor, and is electrically connected to the information collection control module.

Preferably, the information collection control module is provided with a signal transmission module.

Preferably, the steel coil fixing base comprises two supporting bodies arranged in parallel, the upper end surfaces of the two supporting bodies are inclined surfaces and symmetrically arranged; and a side sealing device is respectively disposed at two side gaps of the two supporting bodies.

Further, a bottom sealing device is disposed between the bottoms of the two support bodies of the steel coil fixing seat to close the gap between the bottoms of the two supporting bodies.

Preferably, the bottom sealing device comprises: a support plate disposed between the two support bodies of the steel coil fixing seat, the support plates are vertically arranged, and a plurality of rollers are evenly spaced apart along the length direction of the lower sides of the support plates to form a slidable mechanism; a sealing plate horizontally disposed on a top surface of the support plate, the size of which corresponds to a gap between the bottoms of the two support bodies.

Preferably, an electromagnetic block is disposed on one end surface of the support plate, and correspondingly, a metal stopper engaged with the electromagnetic block is disposed between the end portions of the two support bodies of the steel coil fixing seat.

Preferably, the sealing plate is a composite layer structure, and the middle is composed of a heat insulating material felt, and both sides are high temperature resistant steel plates.

Preferably, the side sealing device comprises two fixed bottom plates respectively disposed horizontally on the outer side of the two support bodies of the steel coil fixing seat and at the bottom of the gap; the outer side surface of the fixed bottom plate is axially spaced apart from the plurality of guide wheels; And respectively disposed on the two sides of the two support bodies of the steel coil fixing seat, the bottom end of the sealing member is slidably disposed on the guide wheel of the fixed bottom plate; the driving mechanism, including two racks, are respectively horizontally disposed On the two seals, one end of the rack is connected to the seal; a drive shaft is horizontally disposed on the other side of the support body relative to the gap through the two bearing seats; a gear is disposed at each end of the drive shaft, the gear Engages with the rack.

Preferably, the bearing seat is disposed on one side of the support body through a fixing plate, and one side of the fixing plate is provided with a through hole through which the rack passes, and an outer side of the fixing plate above the through hole is provided with a The roller against which the top surface of the rack abuts.

Preferably, the sealing member is a composite layer structure, and the middle part is composed of a heat insulating material felt, and both sides are covered with a high temperature resistant steel plate.

Preferably, the sealing member is a right angle plate structure.

Preferably, a positioning sleeve is disposed on a lower side of the heat insulating cover, and correspondingly, the heat insulating cover tray is provided with a positioning pin that cooperates with the positioning sleeve; the positioning pin is preferably a cone.

Preferably, the heat insulating cover is provided with a venting hole and a corresponding exhaust valve.

Preferably, the heat insulating cover is a composite structure, the outer protective layer is a high-strength steel plate, the middle layer is a heat insulating material, and the inner layer is a high-temperature resistant stainless steel plate.

Preferably, the heat insulating cover is a composite structure, which comprises an inner radiating layer, an electric heating wire layer, an intermediate net cover, an intermediate heat insulating layer and an outer protective layer in order from the inside to the outside; the heat insulating cover composite structure is fixed by anchoring nails.

Material, the inner layer is high temperature resistant stainless steel plate.

Preferably, the heat preservation cover is a square heat preservation cover or a circular heat insulation cover.

Preferably, the electric heating device is an electric heating wire, and the temperature sensor is a thermocouple.

The side sealing device is mainly for increasing the sealing performance, preventing the heat insulating cover from being installed on the inner insulating space of the tray to prevent heat loss, and increasing the sealing performance to improve the utilization of the residual heat of the steel coil in the sealed space.

The heat loss in the heat preservation device is reduced, the stability of the temperature heat preservation is enhanced, the accuracy of the data during measurement is ensured, the airtightness of the heat preservation device is ensured, the oxidation of internal objects is prevented, the automatic operation level is improved, and the performance effect of the steel coil is improved.

The bottom sealing device closes the opening of the bottom portion, and when the steel coil is discharged from the coiler cavity to the tray, the heat insulating object is placed in position and then the heat insulating cover is covered, and the device automatically traverses during the walking process, so that the device automatically traverses during the walking process The opening at the bottom of the tray is sealed to form a sealed space to ensure that the temperature is not lost and the insulation is achieved.

The transport chain tray insulation cover base is on the upper part of the transport chain tray and is integrally welded to the transport chain tray. In order to increase the bearing capacity of the heat preservation cover, high-strength steel is used for the bottom of the heat preservation cover of the transport chain, the outer cover is covered with thermal insulation material, and the middle anchor anchor is fixed to the outermost high-temperature stainless steel plate. In order to ensure that the thermal insulation cover is hoisted up and down, it is convenient to design the positioning pin shaft design guide sleeve in the middle position of the transportation chain tray insulation cover base. During the lifting installation process, the thermal insulation cover is finally corrected, which increases the positioning accuracy and improves the installation time.

When the steel coil is discharged from the coiler cavity to the tray, the heat retaining cover is closed and positioned by the positioning pin and the positioning sleeve, so that the heat retaining cover can be quickly installed and positioned to form a closed space, so as to ensure that the temperature is not lost.

The gas protection device is installed on the rear cover of the transport chain tray after the hot rolling coiling is completed, and the surface quality is increased to prevent oxidation of the steel coil. The inside of the heat preservation cover is filled with a shielding gas to replace the air in the steel coil. Prevent oxidation of the steel coil to increase the surface quality of the coil.

A venting hole is added inside the heat insulating cover, and an exhaust valve is installed. After the hot-rolling coiling is completed, the steel coil is installed on the rear of the transport chain tray with a heat-insulating cover device, and the inner space is warmed up to 600 °C or more. At the same time, the coil is cooled by laminar flow, and a small amount of water vapor adheres to the surface during the coiling process. In order to ensure the safety of the equipment and improve the quality of the coil, the high temperature gas is removed before the protective cover is introduced into the heat shield.

The outer layer of the heat preservation cover is a high-strength steel plate, and the heat preservation cover needs frequent lifting to ensure the lifting strength. The exterior is a special temperature resistant steel. The middle is covered with thermal insulation material, and the middle anchoring nail is fixed to the innermost part of the high temperature resistant stainless steel plate. In order to ensure the later lifting, add a lifting suction cup at the top of the heat preservation cover. At the same time, due to the nature and type of steel coil, the heat preservation cover can be made into the rest of the form (square insulation cover, circular insulation cover structure), and the temperature field structure is changed to facilitate the performance of the steel coil.

The electric heating device enables the heat preservation cover not only to realize the use of the residual temperature of the hot-rolled steel coil to achieve slow cooling, but also to perform secondary heat treatment on some special steel materials to realize secondary tempering to improve the performance of the steel coil to refine the crystal grains.

The information detection transmitting module records the temperature of the coil in the heat preservation cover. The information inside the thermal insulation cover is identified by adding a detecting component, a PLC system and a wireless transmitting device. A thermocouple is implanted inside the heat shield, and the temperature range is 0 to 1100 degrees, which is used to detect the temperature change of the air inside the heat shield.

In order to transmit data such as the air temperature in the heat shield to the ground server, the relevant coil data information is transmitted to the downstream. By installing a wireless remote control box on the outer surface of the original heat preservation cover, the wireless and power storage device is borrowed to realize the functions of mobile temperature measurement sampling, data wireless transmission, and logistics information writing and reading.

The beneficial effects of the invention:

The semicircular structure design of the invention has the characteristics of light weight structure, good heat preservation effect, convenient loading and unloading of the steel coil, high degree of automation and good airtightness, and further optimizes the heat preservation, soaking and anti-oxidation effects of the device.

1. After the coiling is completed, the heat preservation is fast, and the effect is optimal: the heat preservation in the high temperature area can effectively improve the performance index. Insulation in low temperature areas, uneven organization or cooling has occurred, and the effect is greatly reduced.

2. High-efficiency insulation is the key, changing the cooling rate and affecting the material performance: “Laminar cooling + post-roll cooling control” is an important part of the performance improvement of high-strength steel. Different products have different thermal material properties due to different compositions and different temperature processes.

3. The holding time is prolonged, which is beneficial to the performance uniformity and performance softening of the material: 980QP, 980DP-GI (limit specification), 1180QP hot coil insulation ≥ 6 hours, 980CP hot coil insulation ≥ 12 hours.

DRAWINGS

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention.

Figure 2 is a side view of Embodiment 1 of the present invention.

Figure 3 is a front elevational view of Embodiment 2 of the present invention.

Figure 4 is a front elevational view of Embodiment 3 of the present invention.

Figure 5 is a partial cross-sectional view of a heat insulating cover in accordance with an embodiment of the present invention.

Fig. 6 is a perspective view showing a first embodiment of the present invention.

Figure 7 is a front elevational view of Embodiment 1 of the present invention.

Figure 8 is a perspective view of the bottom sealing device in the first embodiment of the present invention.

Figure 9 is a front elevational view of Embodiment 1 of the present invention.

Figure 10 is a side view of Figure 9.

Figure 11 is a bottom perspective view of Embodiment 1 of the present invention.

Fig. 12 is an enlarged schematic view showing a portion A of Fig. 11;

Detailed ways

Referring to FIG. 1 to FIG. 12, a mobile hot coil heat treatment heat treatment device of the present invention includes

Base plate 1;

a coil holder 2 disposed at a center of the bottom plate 1;

a tray 3, an annular structure, horizontally sleeved in the middle of the coil holder 2;

The heat insulating cover 4 has a lower end opening and is disposed on the tray 3, and the inner cavity volume is larger than the steel coil 100;

The electric heating device 5 is disposed on the inner side wall of the heat preservation cover 4;

a temperature sensor 6 disposed in the heat retention cover 4;

The information collection control module 7 is electrically connected to the information acquisition control module 7 by the electric heating device 5 and the temperature sensor 6.

Further, a gas protection device and gas sensors 8, 8' are further included, and the information acquisition control module 7 is electrically connected to each other.

Preferably, the information collection control module 7 is provided with a signal transmission module.

Preferably, the steel coil fixing base 2 includes two supporting

bodies

21, 22 juxtaposed, the upper end faces of the two supporting

bodies

21, 22 are inclined surfaces and symmetrically disposed; the two side gaps of the two supporting bodies 21, 22 A side sealing device 9, 9' is provided separately.

Further, a bottom sealing device 10 is provided between the bottoms of the two

support bodies

21, 22 of the coil holder 2 to close the gap between the

bottom portions

21, 22 of the two support bodies.

Preferably, the bottom sealing device 10 comprises

The support plate 101 is disposed between the two

support bodies

21 and 22 of the steel coil fixing base 2, and the support plate 101 is vertically arranged. The lower sides of the support plate 101 are evenly spaced apart from each other along the longitudinal direction to form a slidable portion. mechanism;

The sealing plate 103 is horizontally disposed on the top surface of the support plate 101 and has a size corresponding to a gap between the bottoms of the two

support bodies

21, 22.

Preferably, an electromagnetic block 104 is disposed on one end surface of the support plate 101. Correspondingly, a metal stopper that cooperates with the electromagnetic block is disposed between the end portions of the two support bodies of the steel coil fixing base.

Preferably, the sealing plate 103 is a composite layer structure, and the middle is composed of a heat insulating material felt, and both sides are high temperature resistant steel plates.

Preferably, the side sealing device 9 (taking the side sealing device 9 as an example, the same below) includes

The two fixed bottom plates 91, 91' are horizontally disposed on the outer side of the two

support bodies

21, 22 of the steel coil fixing base 2, and at the bottom of the gap; the outer side surfaces of the fixed bottom plates 91, 91' are axially spaced apart from each other by a plurality of guide wheels 92. , 92';

The two seal members 93, 93' are respectively disposed at the gaps on both sides of the two

support bodies

21, 22 of the coil holder 2, and the bottom ends of the seal members 93, 93' are slidably disposed on the guide plate 91. On wheels 92, 92';

Drive mechanism 94, including,

Two racks 941, respectively, are horizontally disposed on the two seals 93, 93', one end of the rack 941 is connected to the seals 93, 93';

A drive shaft 942 is horizontally disposed on the other side of the support body 21 with respect to the gap through the two bearing seats 943; a gear 944 is disposed at each end of the drive shaft 942, and the gear 943 is meshed with the rack 941.

Preferably, the bearing block 943 is disposed on one side of the support body 221 through a fixing plate 944. One side of the fixing plate 945 is provided with a through hole 9451 through which the rack 941 passes, and a fixing above the through hole 9451 A roller 946 is provided on the outer side of the plate 945 against the top surface of the rack 941.

Preferably, the sealing member 93 is a composite layer structure, the middle is a heat insulating material, and both sides are covered with a high temperature resistant steel plate.

Preferably, the sealing member 93 is a right angle plate structure.

Preferably, the sleeve 12 is disposed at a lower portion of the side of the heat insulating cover 4, and correspondingly, the heat insulating cover tray 3 is provided with a positioning pin 13 that cooperates with the positioning sleeve 12; the positioning pin 13 is preferably a cone.

Preferably, the heat insulating cover 4 is provided with a venting hole and a corresponding exhaust valve 41.

Preferably, the heat insulating cover 4 is a composite structure, the outer protective layer is a high-strength steel plate, the middle layer is a heat insulating material, and the inner layer is a high-temperature resistant stainless steel plate.

Preferably, the heat insulating cover 4 is a composite structure including an inner radiation layer 42, an electric heating wire layer 43, an intermediate mesh cover 44, an intermediate heat insulating layer 45, and an outer protective layer 46 in order from the inside to the outside. The heat shield composite structure is fixed by anchor nails 47.

Referring to FIG. 3 and FIG. 4, the heat insulating cover 4 is a square heat insulating cover or a circular heat insulating cover.

Preferably, the electric heating device 5 is an electric heating wire, and the temperature sensor is a thermocouple.

The invention improves the heat treatment of the steel coil after the coiling, and at the same time realizes the purpose of annealing the waste heat of the coil which has just been wound up, and greatly improves the time after the coil is coiled to enter the heat preservation and annealing device. The performance improvement is not sufficient, and the performance of the strip length and width direction fluctuates greatly.

For special batches of hot-rolled strip steels, special processing such as in-depth processing is required. The heating device integrated inside the heat-insulation cover and the protective gas cooling input can be combined to achieve temperature control under the necessary conditions.

Claims

A mobile hot coil heat treatment device, characterized in that

Bottom plate

a steel coil fixing seat disposed on the center of the bottom plate;

a tray, a ring structure, horizontally sleeved in the middle of the steel coil fixing seat;

a heat insulating cover, the lower end is open, and the cover is disposed on the tray, and the inner cavity volume is larger than the steel coil;

An electric heating device is disposed on an inner side wall of the heat preservation cover;

a temperature sensor disposed in the heat preservation cover;

The information collection control module is electrically connected to the information acquisition control module.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, further comprising a gas protection device and a gas sensor, and electrically connected to the information acquisition control module.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 2, wherein the information acquisition control module is provided with a signal transmission module.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein the steel coil fixing base comprises two supporting bodies juxtaposed, the upper end faces of the two supporting bodies are inclined surfaces, and are symmetrically arranged; A side sealing device is respectively disposed at the gaps on both sides of the body.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 4, wherein a bottom sealing device is disposed between the bottoms of the two support bodies of the steel coil fixing seat to close the gap between the bottoms of the two support bodies. .
A mobile hot-roll heat insulating heat treatment apparatus according to claim 4, wherein said side sealing means comprises

Two fixed bottom plates are respectively horizontally disposed on the outer side of the two support bodies of the steel coil fixing seat and at the bottom of the gap; the outer side surfaces of the fixed bottom plate are axially spaced apart from each other;

Two sealing members are respectively disposed on the two sides of the two support bodies of the steel coil fixing seat, and the bottom end of the sealing member is slidably disposed on the guide wheel of the fixed bottom plate;

Drive mechanism, including,

Two racks are respectively disposed horizontally on the two sealing members, and one end of the rack is connected to the sealing member;

A drive shaft is horizontally disposed on the other side of the support body with respect to the gap through the two bearing seats; a gear is disposed at each end of the drive shaft, and the gear meshes with the rack.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 6, wherein the bearing housing is disposed on one side of the support body through a fixing plate, and one side of the fixing plate is provided for the rack to pass through The through hole, the outer side of the fixing plate above the through hole is provided with a roller that abuts against the top surface of the rack.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 6, wherein the sealing member is a composite layer structure, and the middle portion is composed of a heat insulating material felt, and both sides are covered with a high temperature resistant steel sheet.
The mobile hot-roll heat insulating heat treatment apparatus according to claim 6 or 8, wherein the sealing member has a right angle plate structure.
A mobile hot coil heat treatment heat treatment apparatus according to claim 5, wherein said bottom sealing means comprises

a support plate disposed between the two support bodies of the steel coil fixing seat, the support plate is vertically arranged, and a plurality of rollers are evenly spaced apart along the longitudinal direction of the lower sides of the support plate to form a slidable mechanism;

The sealing plate is horizontally disposed on the top surface of the support plate and has a size corresponding to a gap between the bottoms of the two support bodies.
The mobile hot-roll heat-insulation heat treatment apparatus according to claim 10, wherein an electromagnetic block is disposed on one end surface of the support plate, and correspondingly, between the ends of the two support bodies of the steel coil fixing seat Set the metal stop that matches the electromagnetic block.
The mobile hot-roll heat preservation heat treatment device according to claim 5, wherein the sealing plate is a composite layer structure, and the middle portion is composed of a heat insulating material felt, and both sides are high temperature resistant steel plates.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein a positioning sleeve is disposed on a lower side of the heat-insulation cover, and correspondingly, a positioning pin matched with the positioning sleeve is disposed on the heat-insulation cover tray; The locating pin is preferably a cone.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein the heat insulating cover is provided with a vent hole and a corresponding exhaust valve.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein the heat-insulation cover is a composite structure, the outer protective layer is a high-strength steel plate, the intermediate layer is a heat insulating material, and the inner layer is a high-temperature resistant stainless steel plate.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein the heat-insulation cover is a composite structure, which comprises an inner radiation layer, an electric heating wire layer, an intermediate mesh cover, an intermediate heat insulation layer, and the like, in order from the inside to the outside. Outer protective layer.
The mobile hot-roll heat preservation heat treatment apparatus according to claim 1, wherein the heat-insulation cover composite structure is fixed by anchoring nails.
The mobile hot coil heat preservation heat treatment device according to claim 1, wherein the heat insulating cover is a square heat insulating cover or a circular heat insulating cover.
A mobile hot-roll heat insulating heat treatment apparatus according to claim 1, wherein said electric heating means is an electric heating wire, and said temperature sensor is a thermocouple.